S4 Quattro Wagon V8-4.2L (BHF) (2008)
Checking primary voltage
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Switch the ignition on.
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminals
3 to 4 for voltage.
Specified value: 0.400 to 0.500 Volts
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Switch the ignition off.
If the specified value was obtained:
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Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) ( G130) or Oxygen Sensor (O2S) 2 Behind Three Way
Catalytic Converter (TWC) (G131).
If the specified value was not obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623). Refer to => [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair.
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Using a Multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) ( G130) electrical harness connector